I did it with a 300 MHz Celeron. You heard me.

I did multiple times on a 900-something mhz Athlon. Back when compile everything was the only option.

For me at least, the longest part was compiling OpenOffice.

Went on a weekend trip. Started the OOO compilation, allowed it to also install some dependencies like Blackdown (?) Java.

Decided, hey, might was well time it, for fun.

I came back 2 days later, it had just finished. The compilation took almost 2 full days :-)